Since the Revell-Monogram cab is a '50, and Ford used the same cab from '48 to '52, why not try listing it as a '48 next time? Most judges at the shows I have been to didn't have any idea what they're looking at in the first place, and it would be 'technically' correct to refer to it as a '48 anyway...
But anyway- I would love to see a flat or suede category. The only issue then would be, would 'rusty' or 'weathered' vehicles be included in that group as well, or would the rustbuckets get their own category? I can see someone with a flat-painted car taking offense to a rusty model beating his entry, or vice-versa.